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insulation fire bricks

The refractoriness of clay bricks is comparable to that of silicon bricks, up to 1690~ 1730 ° C, but the softening temperature under load is more than 200 ° C lower than that of silicon bricks.

Description

Product Specifications: Large knife edge, large axe size 230 * 114 * 65/55mm

Small knife edge, size axe size 230 * 114 * 65/45mm

High load softening temperature, strong acid resistance solution or slag chemical erosion, high compressive strength at room temperature, excellent wear resistance.

Clay refractory bricks refer to clay products with Al2O3 content of 30% to 40% aluminum silicate. Solid clay refractory bricks are one of the oldest building materials in the world. From the Mausoleum of the First Emperor of Qin in Shaanxi to the Great Wall of Ming and Qing Dynasties in Beijing, it has inherited the architectural history of the Chinese nation for thousands of years. It is still a beloved building material of the Chinese people. Clay refractory bricks are made of local materials, which are cheap and durable. They also have the advantages of fire prevention, heat insulation, sound insulation and moisture absorption. They are widely used in civil construction projects.

The refractoriness of clay bricks is comparable to that of silicon bricks, up to 1690~ 1730 ° C, but the softening temperature under load is more than 200 ° C lower than that of silicon bricks. Because in addition to mullite crystals with high refractoriness, clay bricks also contain nearly half of the low melting point amorphous glass phase.

In the temperature range of 0~ 1000 ℃, the volume of clay bricks expands uniformly with the increase of temperature. The linear expansion curve is similar to a straight line, and the linear expansion rate is 0.6%~ 0.7%, which is only about half of that of silicon bricks. When the temperature reaches 1200 ℃ and then continues to heat up, its volume will start to shrink from the expansion maximum. The residual shrinkage of clay bricks leads to the loosening of masonry ash joints, which is a major disadvantage of clay bricks. When the temperature exceeds 1200 ℃, the low melting point in clay bricks gradually melts, and the particles are very close to each other due to surface tension, resulting in volume shrinkage.

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